Determination of Acetaldehyde and Acraldehyde in Water with Headspace Gas Chromatography

Objective To establish the method of acetaldehyde and acraldehyde in water with headspace gas chromatography. Methods Acetaldehyde and acraldehyde in the water samples were extracted by headspace technology,then analyzed with DB-624 capillary column. In the same time,they were determined with GC by controlling the temperature. Retention time of the peaks was used for qualitative analysis,while external standard method was used for quantitative analysis. Results In 3.0-250 μg/L, the regression equation for acetaldehyde was y=406.83 x+0.847,r=0.999 9,the lowest detection limit was 1.0 μg/L. In 6.2-500 μg/L, the regression equation for acraldehyde was y=207.53 x-0.450,r=0.999 8,the lowest detection limit was 3.3 μg/L. The rates of recovery were 90.0%-95.5%,and RSDs were 2.1%-3.7%. Conclusion This method is simple,rapid,sensitive and is applicable to the determination of acetaldehyde and acraldehyde in water.